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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '926d1d44f497d4b57dbfb3060cd5aaa8b6ebaa057cb2959c114ba430a3f370c8' 
  AND token = 'VwMyU8kAUQ1YMxdegjIA/vLaXex3hJchXHpxmxlW9j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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