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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd441a6d535a5c4a330df38dc5d46be0df689d1f17030b82df9679ea072581a35' 
  AND token = '6v32kzB7MLhVrHKweslB2UEG5XD8u5C2e7ipV0wvXd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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