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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca10f226b6462d77cb3b136d1dfceed8c05492ca0266a5ba670b9dd0dad87120' 
  AND token = 'sQ/fnMw7Pi8onn68lAAEsg9lD2qSufoAWa4cQdXH6g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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