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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd9ff3477ff3bad5abab76e614baab230309dc2062342fde15882b543d26eacc' 
  AND token = 'UAdXHhD2ekCfID92oSZea8o3QQF9psr3CroNpKVn878=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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