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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9fb06d75f9533c0ec6c5300f4cd450dcbcb8dc07125d9864ccdbf95aa64ca5b' 
  AND token = 'ThcDHfe2OGL5wsausZv1AVh0nvzcqgVkv2Gc9Ybe600=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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