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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a71e09cfa024ab8ead8ae70d2b9d6963e75afef6d173989d98fd977c76c69d7' 
  AND token = '6/kVXwYaw/ZkGoV68A9RfHba/9uk1FGDFlLSZ7JcGUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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