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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0314a7935603c8904e2cbb9f1d5ccf546fba61b3c2a9e6a110afdacb94b05ff6' 
  AND token = 'xZzgxfmDvCVNOFN2SKT4n3wieGtXAlVIcw6P3NDJK8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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