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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f1a2dca9dac6952b035d3b68aefc2c27a60fe1502f1cf8d7e21f23504bf4d6d' 
  AND token = 'fsruvWCKMcUiiAHoXSqTD5iaURNu+rjQFDWWpBfhCEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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