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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5537578845366ebdcd87feb0c8ecaaa0b563e38380a8c4b82b480690b8defe0' 
  AND token = 'QatK5H7xLGZP7/0bLmxrQ5Kwpu1ygOFtNs5RN9wEFK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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