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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0eec12ef24f14458e94cc77401d2a683e0ef9cff9d5461a6ff7117c4450c61c6' 
  AND token = 'MjkMfe3Bn3K3GiUJX8ANQJjbYrfgTqAe2q5q1Mqhrtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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