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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e24e49ae0370966617a26c85e01f24cde467fa1706be7c0deb191f0a2ee3295' 
  AND token = 'hLIfDUJ29Ddb31ohIc6Pu6NZcw6Dis8E5k6bxZ5ija0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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