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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b6b492357a0859a8025294272cd07cb265d6eaa8edc02e0a8bd047b4c4b2f62' 
  AND token = '24IdlhWIIJtEmoyND/jXW13s3cEJ4bjPGHFGRUpvjJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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