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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d6a1226b1ac5879d8999edb3d42391b3a8dd4db1a4bb231ddea92d9cd715b75' 
  AND token = '5X0yRcdiQFz9YN9RNr9sAIOHxzecFqtyLuS3MUenxyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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