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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0d2523bf899442dba52b28becb1e7fd3b35ca0838ee8062167276c48ad20648' 
  AND token = 'B4P8MjrbLMpZNkpxYabRkVQ4QIrtPXowwdmKSRo5T2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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