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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb541bf81d8cdce235c215ab35136fe8ea38eca5abb1efa618a34e88bc4f3bfa' 
  AND token = 't9mJdYrVHAyZwyz56iukJ194XSWvzO/2nc10s1nIPMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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