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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52e387a9712882c25a87072903351188c570377da004e535b78da3792867021c' 
  AND token = 'akMHwU0ta6E4xrabUqZnlCfX1HUgi9v2qwkJhHHL5Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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