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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f8f5025ebec6c4e0d8dd6dfe5828a2bdb8c8564da77ae9383aa4c2c3c62930d' 
  AND token = 'buQGBWvij8cLa687X9ch3D6kIQLxKUQ1V9bqebquSXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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