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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad3afe47d3970ec6fe9e926b650c138a01a895b078665500ca0118b55e2ce1a1' 
  AND token = 'P1810WEiihpmc1H6LBS509PDbFwUCKa+IdPnosw3xrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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