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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df9411ebce0de7ffdeae3be67896706485f80a3a6fc827cca1d20e634c8e6e54' 
  AND token = '79+66108tcuhPruCLqucGPe3lyM3iNMMG9805jC6Ssc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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