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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2854e04ad8ee26c91be043b95a7e6e3d4291ddb5c787021512d826c3fb24bb7' 
  AND token = 'TMXol6b0o2Hu8Ku3CYSlCsYhrQVaPUg9OxOYTaiKJJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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