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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '435a6ad2cded71f409e93f4bc507438e7d2513e9f7a936debb95cac6ee700dc6' 
  AND token = 'qWOY5ZyrzAD22ZNLPrUIzKIOn1nY0JddOvriOQQGYi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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