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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3149e8966fdcdace2ca2c550ba96c3164b0c2857a46543a2840e1cabcaf972f8' 
  AND token = 'VYEwvrSIvbBvlzw27M8ubMxtbR5HfcFNJbziedE9IrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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