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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27ecc2ea1df35f4230c0e95f1adcc9ce3e3d05eec7b92d165fb0bb30974369f6' 
  AND token = '47IOjOV9Af9oFidH1BL0mUq2FsFxiPD0REfBoXk3eDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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