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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4ece9f7966f0a9094c9c95a52a5971962621ccece13ad6e109838711c64f616' 
  AND token = '9U+hclwwzN9KG/yVzcjtjncaSX1Qt12fx+hWvU8QX/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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