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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfe74841c2c1e6f8c723d2aad47610e9e2967f7fecbb8e730bb130cdc0ece511' 
  AND token = 'BRxCKOwW8YAbe3L0nPTK8V9/cjPXhtvwgYe+pQ7IXdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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