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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '492b1a8b5846d995df9acdb907b59f3218d98c2503648a9b12514c5937480a7c' 
  AND token = 'cpbHzkSvc6Q8UP/a0YOBqfHAd85WSL6G8lgeF1ZFyP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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