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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a4b166207303edd852f8c1310b89c77a1772b2d6b9551d1684d328edfb8c98f' 
  AND token = 'j79RFWSB5bp2pWRh6UpYQRcsJbXVufzzY0WnOcANK2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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