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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ca5fbf5a9aec9d6970e3818fdc398ec5d0d9dcd7cda192c97031e78cdc8620c' 
  AND token = 'kaHwuEsDROgrR1fLgKs0E+OXE6VY3ww6k8Zo80Z4ihE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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