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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a29ba0fafd130397f24b2c97302bd52539bd38c35481894dc9e808c6de60ccd9' 
  AND token = 'NKTzwUfeDyryqhMQTLdYeC8+hVoQQW24A4K98U75xaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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