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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb3320637900c6250461b6946ddb8f9040fa535714303019176b9cff75c6998d' 
  AND token = '5SM7zaf0LjHdQzrxnFvEiVvBDS7Q13CV12HQyFD+WeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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