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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f41a6837706f74212aa3096e1d9f85a093ea99bdb0c812ce1ddf07a884112c69' 
  AND token = 'G/iy2ndeJWR/F13fshPFovj1iT1etG51w7PWCMIdLxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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