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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '482b1abf439f0a32b39bbc9e07b9d6c7322d344fa2be31e02def7f79a7d00e5e' 
  AND token = 'wIQlRM9xggfuiq7G2jDwBRgXO82WFWolt8/04sJcXrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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