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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b57ac7715adef57c7c705ea44d840cde56d13cd420711482429ed6b667892461' 
  AND token = 'r7acenfg9nqdj1IzTaFcCB3R/z3RsdapGe8G3qZuDho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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