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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '112db798508c78184a4b263e1c22a1576b295691cf5b8c3af5e610f010da6329' 
  AND token = 'nQT+muaWjLZxfVZroS9TDguaHrLMutklpaVNuA6Uv/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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