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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c33d919856d81f8b0abb26af45464d78de1abd0c2997bd7efd2ba96ef41145d7' 
  AND token = '03zOKY+tWVsntPAnxFa2F+QdU2UCDB9T2n4zy380EOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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