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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b9bfd42ac23c782dbba9b5982cb9dbe0b4da6804ad14c5bd3111af983926b30' 
  AND token = 'OiBMPDSbILRNkqkvji302Q/c+JOaVFMeB4GFz515IjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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