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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1e682c1a8602d6eb9ab2d088ff8b8adae6bbc62b3de406a56057d4c3635b9af' 
  AND token = 'djIAJcygdKVsp90cOd4AxXBn0X5K1sEJfSUOAG0pA80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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