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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41de854d261854c9bacbc3481c27c3fbbf036fddcbec3d2eeb8abd2f893dfc9e' 
  AND token = 'p+VclI3GT+LbLTkmC9c7ybwQ0pfqSY1M9ZOAn4yEZDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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