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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76649a9f37b2f479ac361fee88df41e647f5dc48bf45757e94a96dfe2c36cd05' 
  AND token = 'jao1dyXL4RqNXW17qAnWpZF+Vn5S6zxN/qpvAvDajNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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