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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f711c3837ea40790ee072b06dc5583b8f03c2b0d08ec822b8a28a8256012549' 
  AND token = 'b58rpH6FIlrYrhD7loaJNvMJV1bvai3J2O9Vu2X5NKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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