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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70efc6b77c96fa70d63e5a673d455c62c4d6a34a23a884b952e3ad0c4b93ff36' 
  AND token = 'W5rMhJ9qFi9ac/ghy7+Rg8/waq8f+jf5ydhuPHKQDu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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