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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c9f699fb10c108a33a2c80b20289613f6ffb428cdc159a29f8d199da2818bb5' 
  AND token = 'Gjf9QuGipfMKMCnQkRuUTHnFGjVZ1pSSMrcswlb1e2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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