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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23eaae86e5ce4143a16eb1feea0072de12bbe63f2ef8c9ca0a6636b39488656d' 
  AND token = '6n8pbc2ieCvkwCy6q9a1Vtu8lsJZdCo7IOdoseXXhpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}