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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd55d9d1f602408267824c35143867c1cfc52cfc147af924cd12f625608eaf46' 
  AND token = '0QsC67fPvwycXvfspDB+8WTLZZJE/QdwP99cjjPD5iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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