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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffa6d986d9902117fb8479cb8b9d7ce494ff6291317ff3247ff384b750e8bb90' 
  AND token = 'joSFitJu+olz7RN7baZMTyPZWzVPCvO5ti2SIfTiA+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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