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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76da4f1d8676a0a323f3c25b11cc57869e9b9c4ae1e0f2cf1d2e81ec6aa1c3b5' 
  AND token = '8TJrkgWRtSMzfrTRQ7MLJLaivQA5UH5CyLeDSHBJx6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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