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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01fe492bd2d48eb03e225eeadc2243fa6a4ad5cd39c8505e09507cb6a2352e79' 
  AND token = 'mFC52HUzV1dLXBQkeBG6WotV5aod9w5uVomB6sbQNss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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