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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '599d455a6795f0d937bd5c439b27805bbf01b4aa2c7e13e0fb0eb5c82f0bd210' 
  AND token = 'Sxijox7ZR7uUHYsDDLpJ+J0L4u+EcILAX6YNzJOz2Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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