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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7031106272d2a2ec0953cb3ab90a094ca23ee91d93d351a98eeaa2ac71976f73' 
  AND token = 'Py4v9rW8thE5qT19eCozPh3o7uKalset7l8haE9phoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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