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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c4dd1d165e76889d182d1d240597810ae20fd14c48d4811d2f974b27c8fc6f3' 
  AND token = '9FwxUq+kGFNylCAG1IFB3Hliq4D6gJmcEkL+oiZJeSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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