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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c0cae7e5d5786ed4c0134a1aee4d8d429661d1940e7625291a6fab6f202593c' 
  AND token = 'pkPBGEUwNmasyI+RzV6Xl1KvPi4NR5+IDcUMR+3tvSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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